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When should you not care about duplicate content?
Common, minimal duplication. When you think the benefit outweighs potential ranking concerns. Consider your cost of fixing the duplicate content situation vs. the benefit you would receive. Remember: duplication is common and search engines can handle it.
The myth of the duplicate content penalty.
A lot of people think that if they have duplicate content that they'll be penalized. In most cases, Google does not penalize sites for accidental duplication. Many, many, many sites have duplicate content.
Google may penalize sites for deliberate or manipulative duplication. For example: auto generated content, link networks or similar tactics designed to be manipulative.
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